R&D Test Systems has installed a Fault Ride Through (FRT) test system rated at 66 kV for the Østerild test facility for wind turbines in Denmark. The system has been developed for Vestas to conduct extreme voltage tests to ensure its turbines meet international standards required for their connection to electric grids.R&D Test Systems designed the new system to meet Vestas’ specific testing requirements following the installation of a large prototype turbine at the Østerild test site in Denmark, the National Test Centre for Large Wind Turbines operated by the Danish Technical University (DTU). Delivering the 66 kV FRT test system took over 12 months and employed a multidisciplinary team of electrical, software, and mechanical engineers with specialist skills in wind turbine testing.